How do you make a movie loop in the sequencer?
Work Fine 2.79
https://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Sequencer/Loop_Media

"Pick a Scene, Image, or Movie strip in the Video Sequence Editor, and use the Strip menu to find the Loop Media operator. A speed effect strip will be created to accomplish the looping effect"

Excelent Script